Screw pile



E. GEIGER Mam '8; 1932.

SCREW PILE Filed July r7, 1928 NVENTOR 'rzz/s /eafyef BY ATTORNEY 3 l l l f l l I I g 1 l 1 n 1 l 1 I I l l n l *35 va much heavier load than Patented Mar. 8, 1932.Y

ERNST'GEIGEB, 'or fIRvmGrou- NEW JEEsEYf SCREW rv rntE i Appnpatibamea'miy -7,' 1928. serial No. 290,923.

Yobject of thisinvention; is tofprovide a piling which may be sunlrnoiselesslygand ywithout vibration, andy which is consequently able less force thanis requiredtojdrive the ordinary piling. n Another object is to provide a piling which mayl be -'conveniently made up in relatively `short,`standard size Asections for convenient transportation and the sections readily coupled together as the.V piling is screwed into the ground. Another object is to provide a pilinv which may be conveniently sunk in water-V caring sand or other'very moist soil withoutthe need for well-pointsor other moisture extractin'gapparatus. Y

Another object is to provide a piling which, *due to the powerfulleverage obtained by-a screwing, actiom will penetrate Vreadily various types of Vsub-stratathrough which it is `very diliicult to drive'the conventional piles. Still anotheryobject ofthe inventionis to provide a ilingwhich due to its peculiar eX- teriorcon guation is highly friotionally resistant to ,straight downward thrusts and which consequently is capableof supporting ordinary piling of the samedian'ieter. f L VOtherand further objectsare toprovidea pile offsimple and practical, construction whichmay be convenientlyand quickly sunk *40 and whichis -well suited 'to the requirements y of economicalmanufacture-.and durability in use Y Anotherobject of the ,invention 'is to pro- Vvide a- Ynovel method 'of slnking the pilngs kwhich will result Yin the production .of a.

crete itself offers a similarthrust lresisting v coupling nipples threaded inacordance with vthe threadinglof the shell sections. The en.-

(strong, durablecompressiony resisting fabriy* cated pil-ing and whichvfac litates expeditious pile sinkage in alltypes of soil. g l n l vln a .preferred embodiment ott the invention, the piling Aconsists of a sectional metal shell screwed into the ground and subsequentlyk lled Ywith concrete;y The-shell is preferably of Vsuliiciently heavy gauge stock so that it may bel screwed home without the' need kfor interior reinforcingmandrels orex.-

terior protectivecasings. The exterior -coniigurationo the shell adapts-it for the screw l ingl operationandfthe generally similar in terior configuration ofjthe shell predetermines the exterior; shape ofthe subsequently cast concrete. VThus the rotting or corrosion',y of the steel shell .afterextended use, docs not ma.- teriallypimpair the strain resistingcapacity of the, piling inasmuch as themoulded con- .contour to thesoil. I f g Preferablythe shell is made up in rela tively short standard size sections which may becoupled together inthe field by internal tering section ofthe (shell maybe provided either withfa piercing or a .cutting point. In

the latter instancc, somefofthesoil vwhich is 'f out away bythe'enteringend of.' the piling,` passes into the interiorlof the shell and may be conveniently removed by air blast or other suitable means.; K i y l With theabove noted and other obj ectsin view, the inventionconsists in certainno'vel features of construction and combinations and arrangements of parts, as will bemore fully `hereinafter in theclaims.' f x The Vinvention `maybernyore fully undery.stoood from thefollowing'description in conv nection f with` *they accompanying drawings, wherein'qf. n

Figi is a broken viewfpartlyinside eleva.- tionand-partly in longitudinal section showl described and printedy out y threaded internal coupling members 11. f

l sections.

The pilingshellis built up of a. plurality of generally similar connected hollow metallic sections. These .Sections kmay be ofi'olled, pressed, or cast metal of sufficient thickness and strength so that they can be screwed into thek round without interior reinforcements.

, Pre erably the sections are of` similar threaded coniiguration both interioi'ly and ei;- te'riorly. The threading may assume many forms buty I prefer to use the buttress threadving illustrated in order to insure maximum fractional resistance toa direct downward thrust. It is well known, of course, that the load sustaining 'ability of piling is for the most part directl f determined by its frictional resistance against. a downward thrust.

' The standard length threaded shelly sections designated byrefeience numerals 10, 10 are'preferably coupledtogetlier by similarly Preferably the abutment lines of adjacent shell sectionsl do not follow the line of the threads but are transverse to the longitudinal axis *of* the piling. lIn coupling two of the piling sections, the coupling piece 11jis partially screwed intoy the ytop of "a previously siinksection V10 yand a superjacent section 1() isA screwed onto the upwardly projecting end of thecoupling piece until lit abuts the subjacent section 10. y

Iny order'torender the shell waterproof, packing rings 12 may be proifided between theabutting ends of adjacent shell sections and such abutting ends are preferably beveled Vas shownin 13 of Fig.y 5 to insure a better compressive'acti'on on the'packing rings.

Preferably all of the sectionsV 10 are of uniform diameter except that the lowermost entering section 10a tapers toward the bottom where it may terminate in a piercing pointer a cutting point. T he latter being illustrated in the present case and is provided with openings 14 so that the soil which is cut away may pass 'into the interior of the sl'iell.

Numerous expedients might be resorted to for sinking the piling and ii'npartingv the necessary rotary motion to the uppermost section ,thereof to'efecft the screwing action.

I have yshowny quitediagrammatically one form` of sinking mechanism which includes asocketmember 15, this socket memberbeing hollowthroughout its length and Vat its lower end shaped to receive the upper end is a' broken longitudinal sectional of one of the sections 10. The socket member is preferably keyed to a worm gear 16, housed within a gear casing 17 and driven from a screw 18. A suitable thrust bearing' 19 is provided between the gear 16 and the bottom of the casing 17 and the upper end of the socket member 15 may be outwardly flanged as at 20, whereby an additional thrust bearing 21 may be disposed between the flange and the sleevelike upward extension 22 of the casing. The hoisting apparatus, such as the cables 23, may be conveniently attached to the casing 17. It

will of course be understoodthat the screw 18 ris driven in any suitable manner to rotate ,the .gearand socket and that the sinking of the pile 'sassisted by the weight of the operatingmechanism which rests upon it. After one'shell section has been substantially sunk,

lect in the lower end of the shell, out through the top'thereof. f

After the sectional shell has been completely assembled, and sunk as shown in Fig. 2, and the soil, ifr any, removed from the bottom thereof, the shell serves as a moulding form for poured'concrete f 21, and thereby determines the exterior configuration Vofthe metal encasedconcrete pile. f

The use of the shell to determine the exterior shape ofthe 'concrete fis an important feature, since the corrosion of the shell after a long period of use cannot materially affect the efficiency of the piling. As the shell rusts out, the concrete itself presents ya threaded vouter surface to the soil. f

' It is believed that the method of sinking the piling will be kfully understood from the fore oing general description of the pilin itsel ,f and its sinking mechanism.` Suc method briefly consists of screwing yinto the grounda sectional metal shell, the interior configuration of which predetermines the shape of a subsequently cast concrete filler and then pouring concrete/into the hollow shell until the latter is completely filled.

Where the piling has a cutting point, the method'jadditionally includes the step of blowing or otherwise 'removing soil fromthe interior of the shell through the open 'upper 'end thereof, either dui-ing' or subsequent to' the sinking operationand the step of coupling additional sections to the top of the 'piling duringy the courseof the sinkage.

'Obviously various changes and alterations v'might be made both in the pilingand the method of sinking it,without departing from the spirit and scope of the appended claims. l Having thus described my invention, what ,I claim as new rand desire toA secure by Letters Patent is as follows: Y l. Asa new element in a fabricated screw Y piling, anV internally and externally screw threaded metal shell includinga plurality ofabutting` sections, internal hollow Vcoupling sleeves connecting said-sections, and waterproof packing rings encircling the sleeves and compressed between adjacent shell sections. i e

2. A method of installinga field-fabricated screw piling whichrincludes thesteps of Y Y .screwing an internally and externally thread- I an internally and externally screw-threaded f sectional metal shell into the ground one secl Jtion at a time, connectingsuperjacent sections to the partially or completely sunken sections by means of similarly threaded coupling sleeves as the various sections are sunk and then filling the completely sunk shell "with concrete.` Signed at New York, in the county of New l York and State of New York, this'5th day 75 of July, A. D. 1928. Y

` ERNST GEIGER. n

" ed sectional metal shell into the ground one section at a time by inserting coupling sleeves into each sectionjafter it is partially or 'completely sunk and screwing .a superj acent section onto the projecting upper end fof the couplingk sleeve, then filling' the completely sunk shell with concrete. 'A i f i 3. ln a fabricated piling'metal shell including a plurality of abutting sections externally and internallyV screw-threaded on continuous and parallel lines and adapted tol be screwed into the ground, similarly threaded internal coupling sleeves connecting and reinforcing the ends of said sections,and a poured concrete iiller within the shell.

,4. In a fabricated piling a hollow ymetal shellincluding a plurality of abutting. sections externally and internally screw-threadcd in continuous andparallel lines and adapted to be screwed into the ground section` by section, similarly threaded internal coupling f sleeves connecting and reinforcing the ends vof said sections, water-proof packing between adjacent sections and a concrete filler poured in the shell.

5.. Asa new element inV a field-fabricated screw piling a fabricated metal tube including a pluralityv of'abutting.V sections screwthreaded'internally and externally on parallel and continuous lines, and similarly screw piling a fabricated metal tube includ- 5, piling which includes the steps of screwing ing a Vplurality of similarv sections screwthreaded internally and externally Yin'parallel and continuous lines, and similarly threaded coupling sleevesconnecting 'and reinforcing the ends of said sections.

8L* Amethod of installing field fabricated 

